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The leave keyword has been replaced by the break keyword for
compatibility with the new FriCAS extension language. See section
ugLangLoopsBreak for more
information.

Curly braces are no longer used to create sets. Instead, use set
followed by a bracketed expression. For example,

set[1,2,3,4]

Curly braces are now used to enclose a block (see section
ugLangBlocks for more information).
For compatibility, a block can still be enclosed by parentheses as well.

Free functions created by the Aldor compiler can now be loaded and used
within the FriCAS interpreter. A free function is a library function
that is implemented outside a domain or category constructor.

New coercions to and from type Expression have been added. For example,
it is now possible to map a polynomial represented as an expression to
an appropriate polynomial type.